[MSP430] Ajust f32/f64 alignment according to MSP430 EABI

lib/Basic/Targets/MSP430.h

public:
   MSP430TargetInfo(const llvm::Triple &Triple, const TargetOptions &)
       : TargetInfo(Triple) {
     TLSSupported = false;
     IntWidth = 16;
     IntAlign = 16;
     LongWidth = 32;
     LongLongWidth = 64;
     LongAlign = LongLongAlign = 16;
+    FloatWidth = 32;
+    FloatAlign = 16;
+    DoubleWidth = LongDoubleWidth = 64;
+    DoubleAlign = LongDoubleAlign = 16;
     PointerWidth = 16;
     PointerAlign = 16;
     SuitableAlign = 16;
     SizeType = UnsignedInt;
     IntMaxType = SignedLongLong;
     IntPtrType = SignedInt;
     PtrDiffType = SignedInt;
     SigAtomicType = SignedLong;
     resetDataLayout("e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16");
   }
   void getTargetDefines(const LangOptions &Opts,
                         MacroBuilder &Builder) const override;
 
   ArrayRef<Builtin::Info> getTargetBuiltins() const override {
     // FIXME: Implement.
     return None;
   }
 
+  bool allowsLargerPreferedTypeAlignment() const override { return false; }
+
   bool hasFeature(StringRef Feature) const override {
     return Feature == "msp430";
   }
 
   ArrayRef<const char *> getGCCRegNames() const override;
 
   ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override {
     // No aliases.

test/CodeGen/msp430-align.c

+// RUN: %clang_cc1 -triple msp430-elf -emit-llvm %s -o - | FileCheck %s
+
+// MSP430 target prefers chars to be aligned to 8 bit and other types to 16 bit.
+
+// CHECK: @c ={{.*}}global i8 1, align 1
+// CHECK: @s ={{.*}}global i16 266, align 2
+// CHECK: @i ={{.*}}global i16 266, align 2
+// CHECK: @l ={{.*}}global i32 16909060, align 2
+// CHECK: @ll ={{.*}}global i64 283686952306183, align 2
+// CHECK: @f ={{.*}}global float 1.000000e+00, align 2
+// CHECK: @d ={{.*}}global double 1.000000e+00, align 2
+// CHECK: @ld ={{.*}}global double 1.000000e+00, align 2
+// CHECK: @p ={{.*}}global i8* @c, align 2
+
+char c = 1;
+short s = 266;
+int i = 266;
+long l = 16909060;
+long long ll = 283686952306183;
+float f = 1.0f;
+double d = 1.0;
+long double ld = 1.0;
+char *p = &c;

test/Preprocessor/init.c

 // MSP430:#define __SIZEOF_PTRDIFF_T__ 2
 // MSP430:#define __SIZEOF_SHORT__ 2
 // MSP430:#define __SIZEOF_SIZE_T__ 2
 // MSP430:#define __SIZEOF_WCHAR_T__ 2
 // MSP430:#define __SIZEOF_WINT_T__ 2
 // MSP430:#define __SIZE_MAX__ 65535U
 // MSP430:#define __SIZE_TYPE__ unsigned int
 // MSP430:#define __SIZE_WIDTH__ 16
-// MSP430-CXX:#define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 8U
+// MSP430-CXX:#define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 2U
 // MSP430:#define __UINT16_C_SUFFIX__ U
 // MSP430:#define __UINT16_MAX__ 65535U
 // MSP430:#define __UINT16_TYPE__ unsigned short
 // MSP430:#define __UINT32_C_SUFFIX__ UL
 // MSP430:#define __UINT32_MAX__ 4294967295UL
 // MSP430:#define __UINT32_TYPE__ long unsigned int
 // MSP430:#define __UINT64_C_SUFFIX__ ULL
 // MSP430:#define __UINT64_MAX__ 18446744073709551615ULL