[flang][runtime] Make NCOPIES= argument of REPEAT a signed integer, & check it

[klausler]

Summary

NCOPIES= is currently a std::size_t in the API. If a negative value is
used, the memory allocation will fail. Change it to be a signed integer,
and crash with a message instead if it be negative.

flang/include/flang/Runtime/character.h

 #define FORTRAN_RUNTIME_CHARACTER_H_
 #include "flang/Runtime/entry-names.h"
 #include <cstddef>
+#include <cstdint>
 
 namespace Fortran::runtime {
 

 void RTNAME(LenTrim)(Descriptor &result, const Descriptor &, int kind,
     const char *sourceFile = nullptr, int sourceLine = 0);
 void RTNAME(Repeat)(Descriptor &result, const Descriptor &string,
-    std::size_t ncopies, const char *sourceFile = nullptr, int sourceLine = 0);
+    std::int64_t ncopies, const char *sourceFile = nullptr, int sourceLine = 0);
 void RTNAME(Trim)(Descriptor &result, const Descriptor &string,
     const char *sourceFile = nullptr, int sourceLine = 0);
 

flang/runtime/character.cpp

 }
 
 void RTNAME(Repeat)(Descriptor &result, const Descriptor &string,
-    std::size_t ncopies, const char *sourceFile, int sourceLine) {
+    std::int64_t ncopies, const char *sourceFile, int sourceLine) {
   Terminator terminator{sourceFile, sourceLine};
+  if (ncopies < 0) {
+    terminator.Crash(
+        "REPEAT has negative NCOPIES=%jd", static_cast<std::intmax_t>(ncopies));
+  }
   std::size_t origBytes{string.ElementBytes()};
   result.Establish(string.type(), origBytes * ncopies, nullptr, 0, nullptr,
       CFI_attribute_allocatable);