[llvm-exegesis] Disable exhaustive tests on Windows

When looking at the slowest lit tests, I'm seeing these four tests take
two to eight minutes. Test coverage on Linux should be sufficient for
the functionality on top of it not really being useful on Windows at
all.

This was observed when hacking on the new premerge in a windows VM.

Author: boomanaiden154

llvm/test/tools/llvm-exegesis/X86/inverse_throughput/inverse_throughput-prepare-all-snippets-exhaustively.s

@@ -1,3 +1,8 @@
+# Only run this on Linux. Running on Windows can take an exorbinant amount of
+# time (upwards of ten minutes), and the only place where this functionality is
+# really useful is Linux.
+# REQUIRES: x86_64-linux
+
 # RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=inverse_throughput -opcode-index=-1 --max-configs-per-opcode=1048576 --benchmark-phase=prepare-snippet --benchmarks-file=-
 # FIXME: it would be good to check how many snippets we end up producing,
 # but the number is unstable, so for now just check that we do not crash.

llvm/test/tools/llvm-exegesis/X86/inverse_throughput/inverse_throughput-prepare-all-snippets.s

@@ -1,3 +1,8 @@
+# Only run this on Linux. Running on Windows can take an exorbinant amount of
+# time (upwards of ten minutes), and the only place where this functionality is
+# really useful is Linux.
+# REQUIRES: x86_64-linux
+
 # RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=inverse_throughput -opcode-index=-1 --max-configs-per-opcode=1 --benchmark-phase=prepare-snippet --benchmarks-file=-
 # FIXME: it would be good to check how many snippets we end up producing,
 # but the number is unstable, so for now just check that we do not crash.

llvm/test/tools/llvm-exegesis/X86/uops/uops-prepare-all-snippets-exhaustively.s

@@ -1,3 +1,8 @@
+# Only run this on Linux. Running on Windows can take an exorbinant amount of
+# time (upwards of ten minutes), and the only place where this functionality is
+# really useful is Linux.
+# REQUIRES: x86_64-linux
+
 # RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops -opcode-index=-1 --max-configs-per-opcode=1048576 --benchmark-phase=prepare-snippet --benchmarks-file=-
 # FIXME: it would be good to check how many snippets we end up producing,
 # but the number is unstable, so for now just check that we do not crash.

llvm/test/tools/llvm-exegesis/X86/uops/uops-prepare-all-snippets.s

@@ -1,3 +1,8 @@
+# Only run this on Linux. Running on Windows can take an exorbinant amount of
+# time (upwards of ten minutes), and the only place where this functionality is
+# really useful is Linux.
+# REQUIRES: x86_64-linux
+
 # RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops -opcode-index=-1 --max-configs-per-opcode=1 --benchmark-phase=prepare-snippet --benchmarks-file=-
 # FIXME: it would be good to check how many snippets we end up producing,
 # but the number is unstable, so for now just check that we do not crash.