The TPF assembler supports dwarf4 discriminators, but the TPF
debuggers do not.  Ok to apply?

        * config/s390/tpf.h (SUPPORTS_DISCRIMINATOR): Define to 0 for TPF.

Index: gcc/config/s390/tpf.h
===================================================================
--- gcc/config/s390/tpf.h       (revision 189993)
+++ gcc/config/s390/tpf.h       (working copy)
@@ -116,3 +116,6 @@
 #define MATH_LIBRARY "CLBM"
 #define LIBSTDCXX "CPP2"
 #endif /* ! _TPF_H */
+
+/* GAS supports it, but the debuggers don't, so avoid it.  */
+#define SUPPORTS_DISCRIMINATOR 0

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