0c3704fdbd
The deduplication requires a DenseMap of the same size of the local part of .strtab . I optimized it in e20544543478b259eb09fa0a253d4fb1a5525d9e but it is still quite slow. For Release build of clang, deduplication makes .strtab 1.1% smaller and makes the link 3% slower. For chrome, deduplication makes .strtab 0.1% smaller and makes the link 6% slower. I suggest that we only perform the optimization with -O2 (default is -O1). Not deduplicating local symbol names will simplify parallel symbol table write. Reviewed By: peter.smith Differential Revision: https://reviews.llvm.org/D118577
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