Sign extend remaining implicit addends for consistency.

llvm-svn: 295062
diff --git a/lld/ELF/Target.cpp b/lld/ELF/Target.cpp
index d2c8391..e2a64dd 100644
--- a/lld/ELF/Target.cpp
+++ b/lld/ELF/Target.cpp
@@ -504,7 +504,7 @@
   case R_386_PC32:
   case R_386_PLT32:
   case R_386_TLS_LE:
-    return read32le(Buf);
+    return SignExtend64<32>(read32le(Buf));
   }
 }
 
@@ -2262,7 +2262,7 @@
   case R_MIPS_GPREL32:
   case R_MIPS_TLS_DTPREL32:
   case R_MIPS_TLS_TPREL32:
-    return read32<E>(Buf);
+    return SignExtend64<32>(read32<E>(Buf));
   case R_MIPS_26:
     // FIXME (simon): If the relocation target symbol is not a PLT entry
     // we should use another expression for calculation: