llvm-lto2: Move the LTO::run() action behind a subcommand.

Move LTO::run() to a "run" subcommand so that we can introduce new subcommands
for testing different parts of the LTO implementation.

This doesn't use llvm::cl subcommands because it doesn't appear to be currently
possible to pass an argument not associated with a subcommand to a subcommand
(e.g. -lto-use-new-pm, -mcpu=yonah).

Differential Revision: https://reviews.llvm.org/D31410

llvm-svn: 299967
diff --git a/llvm/test/LTO/Resolution/X86/asm-output.ll b/llvm/test/LTO/Resolution/X86/asm-output.ll
index 68a7a5c..41d2935 100644
--- a/llvm/test/LTO/Resolution/X86/asm-output.ll
+++ b/llvm/test/LTO/Resolution/X86/asm-output.ll
@@ -2,9 +2,9 @@
 ;
 ; RUN: llvm-as < %s > %t1.bc
 ;
-; RUN: llvm-lto2 -filetype=asm -r %t1.bc,main,px -o %t2 %t1.bc
+; RUN: llvm-lto2 run -filetype=asm -r %t1.bc,main,px -o %t2 %t1.bc
 ; RUN: FileCheck --check-prefix=ASM %s < %t2.0
-; RUN: llvm-lto2 -filetype=obj -r %t1.bc,main,px -o %t2 %t1.bc
+; RUN: llvm-lto2 run -filetype=obj -r %t1.bc,main,px -o %t2 %t1.bc
 ; RUN: llvm-objdump -d %t2.0 | FileCheck --check-prefix=ASM %s
 ;
 ; ASM: main: