[symbolizer] Update Release notes. (llvm#142951)

Also add post-commit changes from commit #71ba852

in PR llvm#135857

---------

Co-authored-by: James Henderson <James.Henderson@sony.com>

Author: 2 people

llvm/docs/CommandGuide/llvm-addr2line.rst

@@ -36,6 +36,9 @@ Here are some of those differences:
 -  ``llvm-addr2line`` parses options from the environment variable
    ``LLVM_ADDR2LINE_OPTS`` instead of from ``LLVM_SYMBOLIZER_OPTS``.
 
+- ``llvm-addr2line`` accepts an address with a '+' prefix, e.g. `+0x00777fff`.
+  This is treated as a symbol name by ``llvm-symbolizer``.
+
 SEE ALSO
 --------
 

llvm/docs/ReleaseNotes.md

@@ -266,6 +266,7 @@ Changes to the LLVM tools
 * llvm-strip now supports continuing to process files on encountering an error.
 * In llvm-objcopy/llvm-strip's ELF port, `--discard-locals` and `--discard-all` now allow and preserve symbols referenced by relocations.
   ([#47468](https://github.com/llvm/llvm-project/issues/47468))
+* llvm-addr2line now supports a `+` prefix when specifying an address.
 
 Changes to LLDB
 ---------------------------------

llvm/test/tools/llvm-symbolizer/symbol-search.test

@@ -66,7 +66,7 @@ RUN: llvm-addr2line --obj=%p/Inputs/symbols.so func_01+0A | FileCheck --check-pr
 
 # If '+' is not preceded by a symbol, it is part of a symbol name, not an offset separator.
 RUN: llvm-symbolizer --obj=%p/Inputs/symbols.so +0x1138 | FileCheck --check-prefix=NONEXISTENT %s
-# in addr2line address starting with a `+` sign is a valid address
+# In addr2line address starting with a `+` sign is a valid address.
 RUN: llvm-addr2line --obj=%p/Inputs/symbols.so +0x1138 | FileCheck --check-prefix=CODE-CMD %s
 
 # Show that C++ mangled names may be specified.

llvm/tools/llvm-symbolizer/llvm-symbolizer.cpp

@@ -238,7 +238,7 @@ static Error parseCommand(StringRef BinaryName, bool IsAddr2Line,
   bool StartsWithDigit = std::isdigit(AddrSpec.front());
 
   // GNU addr2line assumes the address is hexadecimal and allows a redundant
-  // "0x" or "0X" prefix or with an optional `+` sign; do the same for
+  // "0x", "0X" prefix or an optional `+` sign; do the same for
   // compatibility.
   if (IsAddr2Line) {
     AddrSpec.consume_front_insensitive("0x") ||