Draft: intel: Combine perf query counter strings
The compiler does a good job of deduplicating strings already, but we can eliminate the pointers to each string by combining the strings into a single char array and storing only an index into that array.
The longest of the char arrays is the descriptions array, which is a little over 45 KiB, so still under MSVC's 64 KiB string literal limit [0]. Because the string length is under 64 KiB we can use uint16_t as the index type, which roughly doubles our savings (from 155 KiB to 320 KiB).
In total, this saves around 320 KiB of .text, or 21% of intel_perf_metrics.c.o, 2.2% of iris_dri.so, 3.7% of libvulkan_intel.so.
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text data bss dec hex filename
1537275 0 0 1537275 1774fb meson-generated_.._intel_perf_metrics.c.o (before)
1211449 0 0 1211449 127c39 meson-generated_.._intel_perf_metrics.c.o (after)
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text data bss dec hex filename
14969603 365584 209984 15545171 ed3353 iris_dri.so (before)
14642315 365584 209984 15217883 e834db iris_dri.so (after)
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text data bss dec hex filename
8844313 214192 22784 9081289 8a91c9 libvulkan_intel.so (before)
8517065 214192 22784 8754041 859379 libvulkan_intel.so (after)
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