Merge pull request swiftlang#1497 from practicalswift/typo-fixes-20160301

[gardening] Fix recently introduced typos: "contet" → "context", "dependcy" → "dependency", "traget" → "target"

Author: trentxintong

lib/ClangImporter/ImporterImpl.h

@@ -821,7 +821,7 @@ class LLVM_LIBRARY_VISIBILITY ClangImporter::Implementation
     ///
     /// When the context into which the declaration will be imported
     /// matches a Clang declaration context (the common case), the
-    /// result will be expressed as a declaration contet. Otherwise,
+    /// result will be expressed as a declaration context. Otherwise,
     /// if the Clang type is not itself a declaration context (for
     /// example, a typedef that comes into Swift as a strong type),
     /// the type declaration will be provided.

lib/Driver/ToolChains.cpp

@@ -907,7 +907,7 @@ addLinkSanitizerLibArgsForDarwin(const ArgList &Args,
                                  StringRef Sanitizer, const ToolChain &TC) {
   // Sanitizer runtime libraries requires C++.
   Arguments.push_back("-lc++");
-  // Add explicit dependcy on -lc++abi, as -lc++ doesn't re-export
+  // Add explicit dependency on -lc++abi, as -lc++ doesn't re-export
   // all RTTI-related symbols that are used.
   Arguments.push_back("-lc++abi");
 

lib/Option/SanitizerOptions.cpp

@@ -48,7 +48,7 @@ SanitizerKind swift::parseSanitizerArgValues(const llvm::opt::Arg *A,
     }
   }
 
-  // Check if the traget is supported for this sanitizer.
+  // Check if the target is supported for this sanitizer.
   if (!Triple.isOSDarwin() && kind != SanitizerKind::None) {
     SmallVector<char, 128> buffer;
     Diags.diagnose(SourceLoc(), diag::error_unsupported_opt_for_target,