Update HerculesCompiler submodule

HerculesCompiler a18ca9f...2b5f477 (7):
> Only insert __prem_channel if entry is main
> Fixed issue with Iterbuffered loops on multiple independent loop nests
> Better support for strange loop nests
> Keep original name for main_dummy after compilation
> Removed white text output for white bg terminals
> Added support for main_dummy_* matching
> Whitelisted NVVM libmath functions

diff --git a/HerculesCompiler b/HerculesCompiler
index a18ca9f172186a47cbe8ed63fd3209bf5eaa45fe..2b5f47725df3224aed5958cba6e79bc336c26e52 160000 (submodule)
--- a/HerculesCompiler
+++ b/HerculesCompiler
@@ -1 +1 @@
-Subproject commit a18ca9f172186a47cbe8ed63fd3209bf5eaa45fe
+Subproject commit 2b5f47725df3224aed5958cba6e79bc336c26e52