Revert "Reland "[gn build] (manually) merge 68a235d""

This reverts commit 94d4ca9.

I reverted 68a235d again in
916be8f.

(cherry picked from commit 93c73d4)

Author: zmodem

llvm/utils/gn/secondary/clang/test/BUILD.gn

@@ -74,9 +74,9 @@ write_lit_config("lit_site_cfg") {
   }
 
   if (llvm_enable_zlib) {
-    extra_values += [ "LLVM_ENABLE_ZLIB=1" ]
+    extra_values += [ "HAVE_LIBZ=1" ]
   } else {
-    extra_values += [ "LLVM_ENABLE_ZLIB=0" ]  # Must be 0.
+    extra_values += [ "HAVE_LIBZ=0" ]  # Must be 0.
   }
 
   if (host_cpu == "x64") {

llvm/utils/gn/secondary/compiler-rt/test/BUILD.gn

@@ -85,8 +85,8 @@ write_cmake_config("lit_common_configured") {
   }
 
   if (llvm_enable_zlib) {
-    values += [ "LLVM_ENABLE_ZLIB=1" ]
+    values += [ "HAVE_LIBZ=1" ]
   } else {
-    values += [ "LLVM_ENABLE_ZLIB=0" ]
+    values += [ "HAVE_LIBZ=0" ]
   }
 }

llvm/utils/gn/secondary/lld/test/BUILD.gn

@@ -49,9 +49,9 @@ write_lit_cfg("lit_site_cfg") {
   }
 
   if (llvm_enable_zlib) {
-    extra_values += [ "LLVM_ENABLE_ZLIB=1" ]
+    extra_values += [ "HAVE_LIBZ=1" ]
   } else {
-    extra_values += [ "LLVM_ENABLE_ZLIB=0" ]  # Must be 0.
+    extra_values += [ "HAVE_LIBZ=0" ]  # Must be 0.
   }
 
   if (current_cpu == "x64" || current_cpu == "arm64" ||

llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn

@@ -208,6 +208,7 @@ write_cmake_config("config") {
       "HAVE_ISATTY=",
       "HAVE_LIBPTHREAD=",
       "HAVE_PTHREAD_SETNAME_NP=",
+      "HAVE_LIBZ=",
       "HAVE_PREAD=",
       "HAVE_PTHREAD_GETSPECIFIC=",
       "HAVE_PTHREAD_H=",
@@ -226,6 +227,7 @@ write_cmake_config("config") {
       "HAVE_SYS_TIME_H=",
       "HAVE_TERMIOS_H=",
       "HAVE_UNISTD_H=",
+      "HAVE_ZLIB_H=",
       "HAVE__CHSIZE_S=1",
       "HAVE__UNWIND_BACKTRACE=",
       "stricmp=_stricmp",
@@ -244,6 +246,7 @@ write_cmake_config("config") {
       "HAVE_ISATTY=1",
       "HAVE_LIBPTHREAD=1",
       "HAVE_PTHREAD_SETNAME_NP=1",
+      "HAVE_LIBZ=1",
       "HAVE_PREAD=1",
       "HAVE_PTHREAD_GETSPECIFIC=1",
       "HAVE_PTHREAD_H=1",
@@ -262,6 +265,7 @@ write_cmake_config("config") {
       "HAVE_SYS_TIME_H=1",
       "HAVE_TERMIOS_H=1",
       "HAVE_UNISTD_H=1",
+      "HAVE_ZLIB_H=1",
       "HAVE__CHSIZE_S=",
       "HAVE__UNWIND_BACKTRACE=1",
       "stricmp=",

llvm/utils/gn/secondary/llvm/test/BUILD.gn

@@ -166,9 +166,9 @@ write_lit_config("lit_site_cfg") {
   }
 
   if (llvm_enable_zlib) {
-    extra_values += [ "LLVM_ENABLE_ZLIB=1" ]
+    extra_values += [ "HAVE_LIBZ=1" ]
   } else {
-    extra_values += [ "LLVM_ENABLE_ZLIB=0" ]  # Must be 0.
+    extra_values += [ "HAVE_LIBZ=0" ]  # Must be 0.
   }
 }