IA MCU psABI support: testsuite

IA MCU psABI support: testsuite

We run Intel MCU psABI tests on Linux/ia32 with -miamcu.  Since Intel
MCU psABI has a different calling convention, the only Linux libc function
allowed is "abort".

asm-support.S contains some support functions as well as a subset of
soft-fp, which is written in assembly with x87 instructions, to provide
intrinsics needed by -miamcu so that Intel MCU psABI tests can run on
Linux.

	* gcc.target/i386/iamcu/abi-iamcu.exp: New file.
	* gcc.target/i386/iamcu/args.h: Likewise.
	* gcc.target/i386/iamcu/asm-support.S: Likewise.
	* gcc.target/i386/iamcu/defines.h: Likewise.
	* gcc.target/i386/iamcu/macros.h: Likewise.
	* gcc.target/i386/iamcu/test_3_element_struct_and_unions.c: Likewise.
	* gcc.target/i386/iamcu/test_basic_64bit_returning.c: Likewise.
	* gcc.target/i386/iamcu/test_basic_alignment.c: Likewise.
	* gcc.target/i386/iamcu/test_basic_array_size_and_align.c: Likewise.
	* gcc.target/i386/iamcu/test_basic_returning.c: Likewise.
	* gcc.target/i386/iamcu/test_basic_sizes.c: Likewise.
	* gcc.target/i386/iamcu/test_basic_struct_size_and_align.c: Likewise.
	* gcc.target/i386/iamcu/test_basic_union_size_and_align.c: Likewise.
	* gcc.target/i386/iamcu/test_bitfields.c: Likewise.
	* gcc.target/i386/iamcu/test_complex_returning.c: Likewise.
	* gcc.target/i386/iamcu/test_passing_floats.c: Likewise.
	* gcc.target/i386/iamcu/test_passing_integers.c: Likewise.
	* gcc.target/i386/iamcu/test_passing_structs.c: Likewise.
	* gcc.target/i386/iamcu/test_passing_structs_and_unions.c: Likewise.
	* gcc.target/i386/iamcu/test_passing_unions.c: Likewise.
	* gcc.target/i386/iamcu/test_struct_returning.c: Likewise.
	* gcc.target/i386/iamcu/test_varargs.c: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@225199 138bc75d-0d04-0410-961f-82ee72b054a4