Adds -Wshorten-64-to-32 to LLVM warnings for non-test code since

Chromium builds Abseil with this warning.

Tests are still built with -Wno-shorten-64-to-32 due to many pre-existing
warnings.

PiperOrigin-RevId: 496421954
Change-Id: I796ca444967474df0bdeb3fe82f85512dab11d8f

absl/copts/GENERATED_AbseilCopts.cmake

@@ -96,6 +96,7 @@ list(APPEND ABSL_LLVM_FLAGS
     "-Wpointer-arith"
     "-Wself-assign"
     "-Wshadow-all"
+    "-Wshorten-64-to-32"
     "-Wstring-conversion"
     "-Wtautological-overlap-compare"
     "-Wtautological-unsigned-zero-compare"

absl/copts/GENERATED_copts.bzl

@@ -97,6 +97,7 @@ ABSL_LLVM_FLAGS = [
     "-Wpointer-arith",
     "-Wself-assign",
     "-Wshadow-all",
+    "-Wshorten-64-to-32",
     "-Wstring-conversion",
     "-Wtautological-overlap-compare",
     "-Wtautological-unsigned-zero-compare",

absl/copts/copts.py

@@ -57,6 +57,7 @@ ABSL_LLVM_FLAGS = [
     "-Wpointer-arith",
     "-Wself-assign",
     "-Wshadow-all",
+    "-Wshorten-64-to-32",
     "-Wstring-conversion",
     "-Wtautological-overlap-compare",
     "-Wtautological-unsigned-zero-compare",