[nfc]For InstrProfData.inc, clang-format functions and opt-out of formatting on the rest

[mingmingl-llvm]

Without this, each time InstrProfData.inc is modified (like in #81691), pre-commit CI clang-format aggressively formats many lines in an unreadable way. Pull request with red pre-commit checks are unpleasant.

• Use // clang-format:<reason> instead of /* clang-format */. The former allows specifying a reason but the latter is not.

• Filed [clang-format] Multiline C macros gets aggressively indentations after formatting.  #82426 to track the issue in clang-format.

[david-xl]

is there a reason in the future to reenable clang format for these macros?

[mingmingl-llvm]

The main motivation is to provide a context why clang-format is turned off.

If clang-format could format macros in a readable way, re-enabling it gives automated code formats.

Meanwhile, clang-format 18 introduces an option SkipMacroDefinitionBody (https://clang.llvm.org/docs/ClangFormatStyleOptions.html#skipmacrodefinitionbody) which seems relevant. However pre-commit CI currently uses clang format version 17, and afaik would emit hard error if .clang-format contains unparsable fields.

[mingmingl-llvm]

reworded to explain the reason to turn off clang-format now (and when we might consider re-enable it). PTAL.