Added GCC convention and __interupt convention for MicroCorruption <INT> call

TI_MSP430.cspec

<?xml version="1.0" encoding="UTF-8"?>
<compiler_spec>
    <global>
        <range space="RAM"/>
    </global>
    <stackpointer register="SP" space="RAM"/>
    <default_proto>
        <prototype name="__stdcall" extrapop="2" stackshift="2">
            <input>
                <pentry maxsize="2" minsize="1">
                    <register name="R12"/>
                </pentry>
                <pentry maxsize="2" minsize="1">
                    <register name="R13"/>
                </pentry>
                <pentry maxsize="2" minsize="1">
                    <register name="R14"/>
                </pentry>
                <pentry maxsize="2" minsize="1">
                    <register name="R15"/>
                </pentry>
                <pentry maxsize="500" minsize="1" align="2">
                    <addr space="stack" offset="2"/>
                </pentry>
            </input>
            <output>
                <pentry minsize="1" maxsize="2">
                    <register name="R12"/>
                </pentry>
                <pentry minsize="3" maxsize="4">
                    <addr space="join" piece1="R13" piece2="R12"/>
                </pentry>
                <pentry minsize="5" maxsize="6">
                    <addr space="join" piece1="R14" piece2="R13" piece3="R12"/>
                </pentry>
                <pentry minsize="7" maxsize="8">
                    <addr space="join" piece1="R15" piece2="R14" piece3="R13" piece4="R12"/>
                </pentry>
            </output>
            <unaffected>
                <register name="SP"/>
                <register name="SR"/>
                <register name="R3"/>
                <register name="R4"/>
                <register name="R5"/>
                <register name="R6"/>
                <register name="R8"/>
                <register name="R9"/>
                <register name="R10"/>
                <register name="R11"/>
            </unaffected>
        </prototype>
    </default_proto>
	<prototype name="gcc" extrapop="2" stackshift="2">
		<input>
			<pentry maxsize="2" minsize="1">
				<register name="R15"/>
			</pentry>
			<pentry maxsize="2" minsize="1">
				<register name="R14"/>
			</pentry>
			<pentry maxsize="2" minsize="1">
				<register name="R13"/>
			</pentry>
			<pentry maxsize="2" minsize="1">
				<register name="R12"/>
			</pentry>
			<pentry maxsize="500" minsize="1" align="2">
				<addr space="stack" offset="2"/>
			</pentry>
		</input>
		<output>
			<pentry minsize="1" maxsize="2">
				<register name="R15"/>
			</pentry>
			<pentry minsize="3" maxsize="4">
				<addr space="join" piece1="R14" piece2="R15"/>
			</pentry>
			<pentry minsize="5" maxsize="6">
				<addr space="join" piece1="R13" piece2="R14" piece3="R15"/>
			</pentry>
			<pentry minsize="7" maxsize="8">
				<addr space="join" piece1="R12" piece2="R13" piece3="R14" piece4="R15"/>
			</pentry>
		</output>
		<unaffected>
			<register name="SP"/>
			<register name="SR"/>
			<register name="R3"/>
			<register name="R4"/>
			<register name="R5"/>
			<register name="R6"/>
			<register name="R8"/>
			<register name="R9"/>
			<register name="R10"/>
			<register name="R11"/>
		</unaffected>
	</prototype>
	<prototype name="__interrupt" extrapop="2" stackshift="2">
		<input>
			<pentry maxsize="500" minsize="1" align="2">
				<addr space="stack" offset="2"/>
			</pentry>
		</input>
		<output>
			<pentry minsize="1" maxsize="2">
				<register name="R15"/>
			</pentry>
			<pentry minsize="3" maxsize="4">
				<addr space="join" piece1="R14" piece2="R15"/>
			</pentry>
			<pentry minsize="5" maxsize="6">
				<addr space="join" piece1="R13" piece2="R14" piece3="R15"/>
			</pentry>
			<pentry minsize="7" maxsize="8">
				<addr space="join" piece1="R12" piece2="R13" piece3="R14" piece4="R15"/>
			</pentry>
		</output>
		<unaffected>
			<register name="SP"/>
			<register name="SR"/>
			<register name="R3"/>
			<register name="R4"/>
			<register name="R5"/>
			<register name="R6"/>
			<register name="R8"/>
			<register name="R9"/>
			<register name="R10"/>
			<register name="R11"/>
		</unaffected>
	</prototype>
</compiler_spec>