Support for SPV_EXT_descriptor_heap

[GloriousPtr]

Command:
rga -s vk-spv-offline -c gfx1100 --comp test.spv --isa out_spv_isa.txt --livereg out_spv_livereg.txt --livereg-sgpr out_spv_livereg_sgpr.txt --O1

Output:

Building for gfx1100... failed.

SPIR-V disassembly for test.spv:
error: 1: Invalid capability operand: 5128

Error: ERROR: Result::ErrorInvalidShader: Failed to validate SPIR-V:
error: 1: Invalid capability operand: 5128

ERROR:
=====  AMDLLPC FAILED  =====

Spirv: spv.txt