[llvm] [DTLTO] [LLVM] Initial DTLTO cache implementation (PR #156433)

[Teresa Johnson via llvm-commits]

================
@@ -0,0 +1,66 @@
+REQUIRES: x86-registered-target, ld.lld
+
+# This test verifies that a cache populated by a ThinLTO link is not reused by a DTLTO link and vice versa.
----------------
teresajohnson wrote:

Probably make this "by an in-process ThinLTO link", since DTLTO is also ThinLTO.

https://github.com/llvm/llvm-project/pull/156433