Don't invoke the python interpreter directly. Use the lit name for it.

Author: dtarditi

clang/test/3C/json_formatting.c

@@ -1,10 +1,10 @@
 // RUN: rm -rf %t*
 // RUN: mkdir %t.alltypes && cd %t.alltypes
 // RUN: 3c -base-dir=%S -alltypes -dump-stats -dump-intermediate -debug-solver %s --
-// RUN: python -c "import json, glob; [json.load(open(f)) for f in glob.glob('*.json')]"
+// RUN: %python -c "import json, glob; [json.load(open(f)) for f in glob.glob('*.json')]"
 // RUN: mkdir %t.noalltypes && cd %t.noalltypes
 // RUN: 3c -base-dir=%S -dump-stats -dump-intermediate -debug-solver %s --
-// RUN: python -c "import json, glob; [json.load(open(f)) for f in glob.glob('*.json')]"
+// RUN: %python -c "import json, glob; [json.load(open(f)) for f in glob.glob('*.json')]"
 
 // Testing that json files output for statistics logging are well formed
 

clang/test/3C/json_formatting_backslash.c

@@ -21,13 +21,13 @@
 // RUN: cp %s .
 // RUN: cp %S/json_formatting.c 'json\_formatting.h'
 // RUN: 3c -alltypes -dump-stats -dump-intermediate -debug-solver -output-dir=out.checked json_formatting_backslash.c --
-// RUN: python -c "import json, glob; [json.load(open(f)) for f in glob.glob('*.json')]"
+// RUN: %python -c "import json, glob; [json.load(open(f)) for f in glob.glob('*.json')]"
 
 // RUN: mkdir %t.noalltypes && cd %t.noalltypes
 // RUN: cp %s .
 // RUN: cp %S/json_formatting.c 'json\_formatting.h'
 // RUN: 3c -dump-stats -dump-intermediate -debug-solver -output-dir=out.checked json_formatting_backslash.c --
-// RUN: python -c "import json, glob; [json.load(open(f)) for f in glob.glob('*.json')]"
+// RUN: %python -c "import json, glob; [json.load(open(f)) for f in glob.glob('*.json')]"
 
 // Even though this looks like a double-quoted string, the Checked C compiler
 // seems to require the backslash to _not_ be escaped. We choose `\_` because it

clang/test/3C/multiple_tu.c

@@ -1,8 +1,8 @@
 // RUN: rm -rf %t
 // RUN: mkdir %t && cd %t
-// RUN: python -c 'import sys, json; json.dump([{"arguments": ["clang", "-c", r"%s"], "directory": r"%S", "file": r"%s"}]*2, sys.stdout)' > compile_commands.json
+// RUN: %python -c 'import sys, json; json.dump([{"arguments": ["clang", "-c", r"%s"], "directory": r"%S", "file": r"%s"}]*2, sys.stdout)' > compile_commands.json
 // RUN: 3c -dump-stats -p %t -base-dir=%S %s | FileCheck -match-full-lines %s
-// RUN: python -c 'import sys, json; exit(any(e["Name"].startswith("ImplicitCastExpr") for e in json.load(sys.stdin)["RootCauseStats"]))' < PerWildPtrStats.json
+// RUN: %python -c 'import sys, json; exit(any(e["Name"].startswith("ImplicitCastExpr") for e in json.load(sys.stdin)["RootCauseStats"]))' < PerWildPtrStats.json
 
 // The compilation database used for this test includes two entries for this
 // file, causing 3C to process it twice. In issue #661, this caused type