[XLA:GPU] Support BF16 data type.
Add an HLO pass to the GPU backend to implement BF16 operations with F32 operations. Define macro XLA_BACKEND_SUPPORTS_BFLOAT16=1 when building tests for the GPU backend to enable BF16 tests for GPU. Enable bfloat16_test and other BF16 tests for GPU. Add hlo_element_type_converter_test. Add convolution tests and matrix multiplication tests for BF16. PiperOrigin-RevId: 182977358
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