[Flang] Make SLES 15 build tests #87498
Merged
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SLES 15 comes with a GCC 7.5 as default, which does not support the C++17
<charconv>
header. This results in build errors when trying to runcheck-flang
.This patch addresses that and uses the older
std::stol
for the string -> number conversion to allow the SLES 15 buildbot (https://lab.llvm.org/staging/#/builders/193) to turn green.