Merge commit '14b0d0de1fb3' from llvm.org/main into next

Author: git apple-llvm automerger

llvm/utils/gn/secondary/llvm/lib/Support/BUILD.gn

@@ -77,6 +77,7 @@ static_library("Support") {
     "ELFAttributes.cpp",
     "Error.cpp",
     "ErrorHandling.cpp",
+    "ExponentialBackoff.cpp",
     "ExtensibleRTTI.cpp",
     "FileCollector.cpp",
     "FileOutputBuffer.cpp",

llvm/utils/gn/secondary/llvm/unittests/Support/BUILD.gn

@@ -41,6 +41,7 @@ unittest("SupportTests") {
     "ErrnoTest.cpp",
     "ErrorOrTest.cpp",
     "ErrorTest.cpp",
+    "ExponentialBackoffTest.cpp",
     "ExtensibleRTTITest.cpp",
     "FSUniqueIDTest.cpp",
     "FileCollectorTest.cpp",