re PR target/55777 (Inlining nomips16 function into mips16 function can result in undefined builtins)

gcc/
	PR target/55777
	* config/mips/mips.c (mips_can_inline_p): New function.
	(TARGET_CAN_INLINE_P): Define.

gcc/testsuite/
	PR target/55777
	* gcc.target/mips/mips16-attributes-5.c,
	* gcc.target/mips/mips16-attributes-6.c: New tests.

From-SVN: r199328