bcb04e050e
(This is a merge of http://go/wvgerrit/151930.) While grepping the code to respond to some CR feedback, I noticed a few places where we had sprinkled some unnecessary "const" specifiers amongst constexpr declarations. This patch cleans them up. There should be little semantic difference in the code after this patch, as it only removes specifiers that were redundant. The only exception is where "constexpr const char* X" was converted to "constexpr char X[]", which has slightly different semantics in edge cases we don't use. Test: x86-64 Bug: 231439638 Change-Id: I0b33777f8d3b718a3410f6d802c51b1220508d34