[lld] Check errors from expanding response files

Previously the response file expansion code would print the error, but
lld would not exit, which was odd.

lld does response file expansion in the different drivers, but it's also
done in main() first, so it's enough to check there.

By checking for these errors we would have caught when D136090
introduced a bug that made lld print errors for response files which
contained "-rpath @foo".

Differental revision: https://reviews.llvm.org/D137477

lld/test/ELF/basic.s

@@ -218,6 +218,12 @@ _start:
 # RUN:   --check-prefix=INVRSP
 # INVRSP: invalid response file quoting: patatino
 
+## Test erroring on a recursive response file, but only once.
+# RUN: echo @%t.responsefile > %t.responsefile
+# RUN: not ld.lld %t @%t.responsefile 2>&1 | FileCheck %s --check-prefix=RECRSP
+# RECRSP: recursive expansion of: '{{.*}}.responsefile'
+# RECRSP-NOT: recursive expansion of
+
 # RUN: not ld.lld %t.foo -o /dev/null 2>&1 | \
 # RUN:  FileCheck -DMSG=%errc_ENOENT --check-prefix=MISSING %s
 # MISSING: cannot open {{.*}}.foo: [[MSG]]

lld/tools/lld/lld.cpp

@@ -89,7 +89,9 @@ static bool isPETarget(std::vector<const char *> &v) {
   SmallVector<const char *, 256> expandedArgs(v.data(), v.data() + v.size());
   BumpPtrAllocator a;
   StringSaver saver(a);
-  cl::ExpandResponseFiles(saver, getDefaultQuotingStyle(), expandedArgs);
+  cl::ExpansionContext ECtx(saver.getAllocator(), getDefaultQuotingStyle());
+  if (Error Err = ECtx.expandResponseFiles(expandedArgs))
+    die(toString(std::move(Err)));
   for (auto it = expandedArgs.begin(); it + 1 != expandedArgs.end(); ++it) {
     if (StringRef(*it) != "-m")
       continue;