Make MinSizeRel builds of stdlib (but not the compiler) produce debug info (swiftlang#33787)

Author: kubamracek

stdlib/cmake/modules/AddSwiftStdlib.cmake

@@ -201,6 +201,9 @@ function(_add_target_variant_c_compile_flags)
       else()
         list(APPEND result "-g")
       endif()
+    elseif("${CFLAGS_BUILD_TYPE}" STREQUAL "MinSizeRel")
+      # MinSizeRel builds of stdlib (but not the compiler) should get debug info
+      list(APPEND result "-g")
     else()
       list(APPEND result "-g0")
     endif()

stdlib/cmake/modules/SwiftSource.cmake

@@ -246,6 +246,9 @@ function(_add_target_variant_swift_compile_flags
   is_build_type_with_debuginfo("${build_type}" debuginfo)
   if(debuginfo)
     list(APPEND result "-g")
+  elseif("${build_type}" STREQUAL "MinSizeRel")
+    # MinSizeRel builds of stdlib (but not the compiler) should get debug info
+    list(APPEND result "-g")
   endif()
 
   if(enable_assertions)