[NPM][opt] Run -O# after other passes in legacy PM compatibility mode

Generally tests run -O# before other passes, not after.

Author: aeubanks

llvm/test/Transforms/LoopVectorize/X86/metadata-enable.ll

@@ -8,6 +8,7 @@
 ; RUN: opt < %s -mcpu=corei7 -O1 -loop-vectorize -S -unroll-allow-partial=0 | FileCheck %s --check-prefix=O1VEC2
 ; RUN: opt < %s -mcpu=corei7 -Oz -loop-vectorize -S -unroll-allow-partial=0 | FileCheck %s --check-prefix=OzVEC2
 ; RUN: opt < %s -mcpu=corei7 -O3 -unroll-threshold=150 -vectorize-loops=false -S -unroll-allow-partial=0 | FileCheck %s --check-prefix=O3DIS
+; RUN: opt < %s -mcpu=corei7 -O1 -loop-vectorize -S -unroll-allow-partial=0 -enable-new-pm=1 | FileCheck %s --check-prefix=O1VEC2
 
 ; This file tests the llvm.loop.vectorize.enable metadata forcing
 ; vectorization even when optimization levels are too low, or when

llvm/tools/opt/opt.cpp

@@ -759,9 +759,6 @@ int main(int argc, char **argv) {
       return 1;
     }
     SmallVector<StringRef, 4> Passes;
-    for (const auto &P : PassList) {
-      Passes.push_back(P->getPassArgument());
-    }
     if (OptLevelO0)
       Passes.push_back("default<O0>");
     if (OptLevelO1)
@@ -774,6 +771,8 @@ int main(int argc, char **argv) {
       Passes.push_back("default<Os>");
     if (OptLevelOz)
       Passes.push_back("default<Oz>");
+    for (const auto &P : PassList)
+      Passes.push_back(P->getPassArgument());
     OutputKind OK = OK_NoOutput;
     if (!NoOutput)
       OK = OutputAssembly