[Driver] Enable __cxa_atexit on Solaris

Starting with Solaris 11.4 (which is now the required minimal version), Solaris does
support __cxa_atexit.  This patch reflects that.

One might consider removing the affected tests altogether instead of inverting them,
as is done on other targets.

Besides, this lets two ASan tests PASS:

  AddressSanitizer-i386-sunos :: TestCases/init-order-atexit.cc
  AddressSanitizer-i386-sunos-dynamic :: TestCases/init-order-atexit.cc

Tested on x86_64-pc-solaris2.11 and sparcv9-sun-solaris2.11.

Differential Revision: https://reviews.llvm.org/D64491

llvm-svn: 366305

clang/lib/Driver/ToolChains/Clang.cpp

@@ -4749,7 +4749,6 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   if (!Args.hasFlag(
           options::OPT_fuse_cxa_atexit, options::OPT_fno_use_cxa_atexit,
           !RawTriple.isOSWindows() &&
-              RawTriple.getOS() != llvm::Triple::Solaris &&
               TC.getArch() != llvm::Triple::xcore &&
               ((RawTriple.getVendor() != llvm::Triple::MipsTechnologies) ||
                RawTriple.hasEnvironment())) ||

clang/test/Driver/cxa-atexit.cpp

@@ -19,7 +19,7 @@
 // RUN: %clang -### -target sparc-sun-solaris -c %s -o /dev/null 2>&1 | FileCheck %s -check-prefix CHECK-SOLARIS
 
 // CHECK-WINDOWS: "-fno-use-cxa-atexit"
-// CHECK-SOLARIS: "-fno-use-cxa-atexit"
+// CHECK-SOLARIS-NOT: "-fno-use-cxa-atexit"
 // CHECK-HEXAGON-NOT: "-fno-use-cxa-atexit"
 // CHECK-XCORE: "-fno-use-cxa-atexit"
 // CHECK-MTI: "-fno-use-cxa-atexit"

clang/test/Driver/solaris-opts.c

@@ -1,4 +1,4 @@
 // RUN: %clang %s --target=sparc-sun-solaris2.11 -### -o %t.o 2>&1 | FileCheck %s
 
-// CHECK: "-fno-use-cxa-atexit"
+// CHECK-NOT: "-fno-use-cxa-atexit"