[lit, python] Always add quotes around the python path in lit

[stella.stamenova]

Summary

The issue with the python path is that the path to python on Windows can contain spaces. To make the tests always work, the path to python needs to be surrounded by quotes.

This is a companion change to: https://reviews.llvm.org/D50206

test/ELF/lto/cache.ll

 ; REQUIRES: x86
 
 ; RUN: opt -module-hash -module-summary %s -o %t.o
 ; RUN: opt -module-hash -module-summary %p/Inputs/cache.ll -o %t2.o
 
 ; RUN: rm -Rf %t.cache && mkdir %t.cache
 ; Create two files that would be removed by cache pruning due to age.
 ; We should only remove files matching the pattern "llvmcache-*".
 ; RUN: touch -t 197001011200 %t.cache/llvmcache-foo %t.cache/foo
 ; RUN: ld.lld --thinlto-cache-dir=%t.cache --thinlto-cache-policy prune_after=1h:prune_interval=0s -o %t3 %t2.o %t.o
 
 ; Two cached objects, plus a timestamp file and "foo", minus the file we removed.
 ; RUN: ls %t.cache | count 4
 
 ; Create a file of size 64KB.
-; RUN: "%python" -c "print(' ' * 65536)" > %t.cache/llvmcache-foo
+; RUN: %python -c "print(' ' * 65536)" > %t.cache/llvmcache-foo
 
 ; This should leave the file in place.
 ; RUN: ld.lld --thinlto-cache-dir=%t.cache --thinlto-cache-policy cache_size_bytes=128k:prune_interval=0s -o %t3 %t2.o %t.o
 ; RUN: ls %t.cache | count 5
 
 ; This should remove it.
 ; RUN: ld.lld --thinlto-cache-dir=%t.cache --thinlto-cache-policy cache_size_bytes=32k:prune_interval=0s -o %t3 %t2.o %t.o
 ; RUN: ls %t.cache | count 4

test/mach-o/dependency_info.yaml

 # Test -dependency_info option
 #
 # RUN: ld64.lld -arch x86_64 -test_file_usage  \
 # RUN:        -dependency_info %t.info \
 # RUN:        -path_exists /System/Library/Frameworks \
 # RUN:        -path_exists /System/Library/Frameworks/Foo.framework/Foo \
 # RUN:        -path_exists /Custom/Frameworks \
 # RUN:        -path_exists /Custom/Frameworks/Bar.framework/Bar \
 # RUN:        -F/Custom/Frameworks \
 # RUN:        -framework Bar \
 # RUN:        -framework Foo
-# RUN: '%python' %p/Inputs/DependencyDump.py %t.info | FileCheck %s
+# RUN: %python %p/Inputs/DependencyDump.py %t.info | FileCheck %s
 
 
 # CHECK: linker-vers: lld
 # CHECK: input-file:  /Custom/Frameworks{{[/\\]}}Bar.framework{{[/\\]}}Bar
 # CHECK: not-found:   /Custom/Frameworks{{[/\\]}}Foo.framework{{[/\\]}}Foo
 # CHECK: input-file:  /System/Library/Frameworks{{[/\\]}}Foo.framework{{[/\\]}}Foo
 # CHECK: output-file: a.out

test/wasm/lto/cache.ll

 ; RUN: opt -module-hash -module-summary %s -o %t.o
 ; RUN: opt -module-hash -module-summary %p/Inputs/cache.ll -o %t2.o
 
 ; RUN: rm -Rf %t.cache && mkdir %t.cache
 ; Create two files that would be removed by cache pruning due to age.
 ; We should only remove files matching the pattern "llvmcache-*".
 ; RUN: touch -t 197001011200 %t.cache/llvmcache-foo %t.cache/foo
 ; RUN: wasm-ld --thinlto-cache-dir=%t.cache --thinlto-cache-policy prune_after=1h:prune_interval=0s -o %t.wasm %t2.o %t.o
 
 ; Two cached objects, plus a timestamp file and "foo", minus the file we removed.
 ; RUN: ls %t.cache | count 4
 
 ; Create a file of size 64KB.
-; RUN: "%python" -c "print(' ' * 65536)" > %t.cache/llvmcache-foo
+; RUN: %python -c "print(' ' * 65536)" > %t.cache/llvmcache-foo
 
 ; This should leave the file in place.
 ; RUN: wasm-ld --thinlto-cache-dir=%t.cache --thinlto-cache-policy cache_size_bytes=128k:prune_interval=0s -o %t.wasm %t2.o %t.o
 ; RUN: ls %t.cache | count 5
 
 ; This should remove it.
 ; RUN: wasm-ld --thinlto-cache-dir=%t.cache --thinlto-cache-policy cache_size_bytes=32k:prune_interval=0s -o %t.wasm %t2.o %t.o
 ; RUN: ls %t.cache | count 4