Rollup merge of #76000 - richkadel:llvm-coverage-map-gen-6b.2, r=wesleywiser
Rollup merge of #76000 - richkadel:llvm-coverage-map-gen-6b.2, r=wesleywiser

Adds --bless support to test/run-make-fulldeps

The ability to "bless" output for some of these tests is critical to
making it practical to adapt tests to unrelated changes.

This is needed for new coverage tests, as shown in PR #76004 .

r? @tmandry
FYI: da39a3ee5e6b4b0d3255bfef95601890afd80709@wesleywiser

graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust