[clang] Only use major version in resource dir

This causes unnecessary churn for downstreams.

For the full discussion, see https://discourse.llvm.org/t/should-we-continue-embed-the-full-llvm-version-in-lib-clang/62094

Differential Revision: https://reviews.llvm.org/D125860

GitOrigin-RevId: e1b88c8a09be25b86b13f98755a9bd744b4dbf14
1 file changed