[analyzer] SATestBuild.py: Use driver for analyzing single-file tests.

Don't bother coming up with a -cc1 run-line ourselves.

This, in particular, gets rid of a macOS-specific code path.

llvm-svn: 362009
diff --git a/clang/utils/analyzer/SATestUtils.py b/clang/utils/analyzer/SATestUtils.py
index 2320652..0ed4a4b 100644
--- a/clang/utils/analyzer/SATestUtils.py
+++ b/clang/utils/analyzer/SATestUtils.py
@@ -1,5 +1,5 @@
 import os
-from subprocess import check_output, check_call
+from subprocess import check_call
 import sys
 
 
@@ -47,18 +47,6 @@
     return Ext in (".i", ".ii", ".c", ".cpp", ".m", "")
 
 
-def getSDKPath(SDKName):
-    """
-    Get the path to the SDK for the given SDK name. Returns None if
-    the path cannot be determined.
-    """
-    if which("xcrun") is None:
-        return None
-
-    Cmd = "xcrun --sdk " + SDKName + " --show-sdk-path"
-    return check_output(Cmd, shell=True).rstrip()
-
-
 def runScript(ScriptPath, PBuildLogFile, Cwd, Stdout=sys.stdout,
               Stderr=sys.stderr):
     """