[NFC] Inclusive language: rename master flag to main flag

[NFC] As part of using inclusive language within the llvm project, this patch
renames master flag to main flag in these comments.

Reviewed By: ZarkoCA

Differential Revision: https://reviews.llvm.org/D114090

GitOrigin-RevId: b11c66accfb1d78324278072ed0069d3bbe835cd
diff --git a/lib/Driver/ToolChains/Clang.cpp b/lib/Driver/ToolChains/Clang.cpp
index 0f20aba..5b77362 100644
--- a/lib/Driver/ToolChains/Clang.cpp
+++ b/lib/Driver/ToolChains/Clang.cpp
@@ -403,7 +403,7 @@
 }
 
 /// Adds exception related arguments to the driver command arguments. There's a
-/// master flag, -fexceptions and also language specific flags to enable/disable
+/// main flag, -fexceptions and also language specific flags to enable/disable
 /// C++ and Objective-C exceptions. This makes it possible to for example
 /// disable C++ exceptions but enable Objective-C exceptions.
 static bool addExceptionArgs(const ArgList &Args, types::ID InputType,