Integrate LLVM at 1506ba95d7c3dca1abff0190550945f6cc263a99

[vivekkhandelwal1]

Update LLVM to llvm/llvm-project@1506ba9.

[vivekkhandelwal1]

@penguin-wwy @qingyunqu The stablehlo build is failing after the LLVM integration because of the changes introduced here: llvm/llvm-project@cc36533. Can you please take a look at the failure and add a fix?

[penguin-wwy]

@penguin-wwy @qingyunqu The stablehlo build is failing after the LLVM integration because of the changes introduced here: llvm/llvm-project@cc36533. Can you please take a look at the failure and add a fix?

main...penguin-wwy:example_dev
Since include(HandleLLVMOptions) has already been done once in llvm cmake, LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING needs to be reset to its default value.