Removing the per process file flag to reduce the llvm filemerge time

Author: ChrisDryden

util/build-run-test-coverage-linux.sh

@@ -57,7 +57,7 @@ export CARGO_INCREMENTAL=0
 export RUSTFLAGS="-Cinstrument-coverage -Ccodegen-units=1 -Copt-level=0 -Clink-dead-code -Coverflow-checks=off -Zpanic_abort_tests -Cpanic=abort"
 export RUSTDOCFLAGS="-Cpanic=abort"
 export RUSTUP_TOOLCHAIN="nightly-gnu"
-export LLVM_PROFILE_FILE="${PROFRAW_DIR}/coverage-%m-%p.profraw"
+export LLVM_PROFILE_FILE="${PROFRAW_DIR}/coverage-%4m.profraw"
 
 # Disable expanded command printing for the rest of the program
 set +x