v2.20.0

GPUCompiler v2.20.0

Diff since v2.19.0

Merged pull requests:

• Compile a representative kernel in the precompilation workload (#1070) (@maleadt)
• Avoid dynamic dispatch in back-end IR code (#1071) (@maleadt)
• SPIR-V: stop removing freeze instructions (#1073) (@maleadt)
• Check that flattened insertvalues reach the SPIR-V back end (#1075) (@maleadt)
• SPIR-V: work around missing bfloat arithmetic legalization in the back-ends (#1076) (@maleadt)