[Driver] Warn about all instances -mios-version-min not just the last

[porglezomp]

Summary

Follow-up to D155123, uniformly handle cases where there are duplicate
-mios-verion-min arguments.

clang/lib/Driver/ToolChains/Darwin.cpp

void darwin::setTripleTypeForMachOArchName(llvm::Triple &T, StringRef Str,
   if (Arch != llvm::Triple::UnknownArch)
     T.setArchName(Str);
 
   if (ArchKind == llvm::ARM::ArchKind::ARMV6M ||
       ArchKind == llvm::ARM::ArchKind::ARMV7M ||
       ArchKind == llvm::ARM::ArchKind::ARMV7EM) {
     // Don't reject -mios-version-min= if we have an iOS triple.
     if (T.isiOS())
-      if (Arg *A = Args.getLastArgNoClaim(options::OPT_mios_version_min_EQ))
+      for (Arg *A : Args.filtered(options::OPT_mios_version_min_EQ))
         A->ignoreTargetSpecific();
 
     T.setOS(llvm::Triple::UnknownOS);
     T.setObjectFormat(llvm::Triple::MachO);
   }
 }
 
 void darwin::Assembler::ConstructJob(Compilation &C, const JobAction &JA,

clang/test/Driver/macho-embedded.c

 // RUN: %clang -arch armv7 -target thumbv7-apple-darwin-eabi -### -c %s 2>&1 | FileCheck %s --check-prefix=CHECK-AAPCS
 // RUN: %clang -target x86_64-apple-macosx10.9 -arch armv7m -### -c %s 2>&1 | FileCheck %s --check-prefix=CHECK-AAPCS
 // RUN: %clang -arch armv7s -target thumbv7-apple-ios -### -c %s 2>&1 | FileCheck %s --check-prefix=CHECK-APCS
 // RUN: %clang -arch armv7s -target thumbv7-apple-darwin -### -c %s 2>&1 | FileCheck %s --check-prefix=CHECK-APCS
 // RUN: %clang -arch armv6m -target thumbv7-apple-darwin -### -c %s 2>&1 | FileCheck %s --check-prefix=CHECK-MACHO-EMBEDDED
 // RUN: %clang -arch armv7m -target thumbv7-apple-darwin -### -c %s 2>&1 | FileCheck %s --check-prefix=CHECK-MACHO-EMBEDDED
 // RUN: %clang -arch armv7em -target thumbv7-apple-darwin -### -c %s 2>&1 | FileCheck %s --check-prefix=CHECK-MACHO-EMBEDDED
 
 // RUN: %clang -arch armv7m --target=thumbv7-apple-ios -mios-version-min=5 -fdriver-only -c %s 2>&1 | FileCheck %s --check-prefix=CHECK-MACHO-EMBEDDED-DIAG
+// RUN: %clang -arch armv7m --target=thumbv7-apple-ios -mios-version-min=5 -mios-version-min=5 -fdriver-only -c %s 2>&1 | FileCheck %s --check-prefix=CHECK-MACHO-EMBEDDED-DIAG
 
 // CHECK-IOS: "-triple" "thumbv7" "thumbv7-apple-ios
 
 // CHECK-AAPCS: "-target-abi" "aapcs"
 // CHECK-APCS: "-target-abi" "apcs-gnu"
 
 // CHECK-MACHO-EMBEDDED-DIAG: warning: argument unused during compilation: '-mios-version-min=5'
 // CHECK-MACHO-EMBEDDED: "-triple" "{{thumbv[67]e?m}}-apple-unknown-macho"
 // CHECK-MACHO-EMBEDDED: "-mrelocation-model" "pic"