[NFC][llvm] Inclusive language: replace master with main in dbg-call-…

…site-spilled-arg.mir

[NFC] As part of using inclusive language within the llvm project, this patch
replaces master with main in `dbg-call-site-spilled-arg.mir`.

Reviewed By: ZarkoCA

Differential Revision: https://reviews.llvm.org/D114097

llvm/test/DebugInfo/MIR/X86/dbg-call-site-spilled-arg.mir

@@ -3,7 +3,7 @@
 # RUN: llc -emit-call-site-info -debug-entry-values -start-after=machineverifier -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s
 # 
 # Command:
-# $ ~/src/builds/llvm-project-master-RA/bin/clang -g -Xclang -femit-debug-entry-values -O2 -c -o spill.o spill.cc -mllvm -stop-before=machineverifier -o spill.mir
+# $ ~/src/builds/llvm-project-main-RA/bin/clang -g -Xclang -femit-debug-entry-values -O2 -c -o spill.o spill.cc -mllvm -stop-before=machineverifier -o spill.mir
 #
 # Source:
 ## extern void callee(int);