[ELF] Support quoted output section names

Similar to e7a7ad1 and
2bf06d9 for other linker script syntax.

Close #60496

Author: MaskRay

lld/ELF/ScriptParser.cpp

@@ -900,7 +900,8 @@ OutputDesc *ScriptParser::readOverlaySectionDescription() {
 }
 
 OutputDesc *ScriptParser::readOutputSectionDescription(StringRef outSec) {
-  OutputDesc *cmd = script->createOutputSection(outSec, getCurrentLocation());
+  OutputDesc *cmd =
+      script->createOutputSection(unquote(outSec), getCurrentLocation());
   OutputSection *osec = &cmd->osec;
   // Maybe relro. Will reset to false if DATA_SEGMENT_RELRO_END is absent.
   osec->relro = seenDataAlign && !seenRelroEnd;

lld/test/ELF/linkerscript/quoted-section-name.test

@@ -1,13 +1,21 @@
 # REQUIRES: x86
 
 ## Handling of quotes is tricky sometimes. Check we do that right and include
-## "foo bar" section into .data as expected.
+## "foo bar" section into ".data foo" as expected.
 
-# RUN: echo '.section "foo bar", "aw"; nop' | llvm-mc -filetype=obj -triple=x86_64-pc-linux - -o %t
-# RUN: ld.lld %t --script %s -o %t2 --print-map | FileCheck %s
-# CHECK:      .data
+# RUN: echo '.section "foo bar", "aw"; nop' | llvm-mc -filetype=obj -triple=x86_64 - -o %t.o
+# RUN: ld.lld %t.o --script %s -o %t --print-map | FileCheck %s
+# RUN: llvm-readelf -S %t | FileCheck %s --check-prefix=SEC
+# CHECK:      .data foo
 # CHECK-NEXT:   {{.*}}(foo bar)
 
+# SEC: ]{{  }}.data foo
+# SEC: ]{{  }}.data bar
+
 SECTIONS {
-  .data : { *("foo bar") }
+  " .data foo" : { *("foo bar") }
+}
+
+OVERWRITE_SECTIONS {
+  " .data bar" : { bar = .; }
 }