[GCC][PATCH][ARM] Add Bfloat16_t scalar type, vector types and machine modes to ARM...

[GCC][PATCH][ARM] Add Bfloat16_t scalar type, vector types and machine modes to ARM back-end [2/2]

gcc/ChangeLog:

2020-01-16  Stam Markianos-Wright  <stam.markianos-wright@arm.com>

	* config/arm/arm.c
	(arm_invalid_conversion): New function for target hook.
	(arm_invalid_unary_op): New function for target hook.
	(arm_invalid_binary_op): New function for target hook.

gcc/testsuite/ChangeLog:

2020-01-16  Stam Markianos-Wright  <stam.markianos-wright@arm.com>

	* g++.target/arm/bfloat_cpp_typecheck.C: New test.
	* gcc.target/arm/bfloat16_scalar_typecheck.c: New test.
	* gcc.target/arm/bfloat16_vector_typecheck_1.c: New test.
	* gcc.target/arm/bfloat16_vector_typecheck_2.c: New test.