[libclc] only check filename part of the source for avoiding duplication (#135710) llvm-diff shows this PR has no changes to amdgcn--amdhsa.bc. Motivation is that in our downstream the same category of target built-ins, e.g. math, are organized in several different folders. For example, in target SOURCES we have math-common/cos.cl, while in generic SOURCES it is math/cos.cl. Based on current check rule that compares both folder name and base filename, target math-common/cos.cl won't override math/cos.cl when collecting source files from SOURCES files in cmake function libclc_configure_lib_source. With this PR, we allow folder name to be different in the process. A notable change of this PR is that two entries in SOURCES with the same base filename must not implements the same built-in.
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