unwind: use sizeof() instead of hardcoded sizes

The statically allocated strings have a fixed size which can be computed using
the sizeof operator rather than duplicating the allocation size which can drift.
NFC.

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@229126 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/Unwind/Unwind-EHABI.cpp b/src/Unwind/Unwind-EHABI.cpp
index 2afe86c..7ebba67 100644
--- a/src/Unwind/Unwind-EHABI.cpp
+++ b/src/Unwind/Unwind-EHABI.cpp
@@ -473,8 +473,9 @@
       char functionBuf[512];
       const char *functionName = functionBuf;
       unw_word_t offset;
-      if ((unw_get_proc_name(&cursor1, functionBuf, 512, &offset) !=
-           UNW_ESUCCESS) || (frameInfo.start_ip + offset > frameInfo.end_ip))
+      if ((unw_get_proc_name(&cursor1, functionBuf, sizeof(functionBuf),
+                             &offset) != UNW_ESUCCESS) ||
+          (frameInfo.start_ip + offset > frameInfo.end_ip))
         functionName = ".anonymous.";
       unw_word_t pc;
       unw_get_reg(&cursor1, UNW_REG_IP, &pc);
@@ -604,8 +605,9 @@
       char functionBuf[512];
       const char *functionName = functionBuf;
       unw_word_t offset;
-      if ((unw_get_proc_name(&cursor2, functionBuf, 512, &offset) !=
-           UNW_ESUCCESS) || (frameInfo.start_ip + offset > frameInfo.end_ip))
+      if ((unw_get_proc_name(&cursor2, functionBuf, sizeof(functionBuf),
+                             &offset) != UNW_ESUCCESS) ||
+          (frameInfo.start_ip + offset > frameInfo.end_ip))
         functionName = ".anonymous.";
       _LIBUNWIND_TRACE_UNWINDING(
           "unwind_phase2(ex_ojb=%p): start_ip=0x%llX, func=%s, sp=0x%llX, "
diff --git a/src/Unwind/UnwindLevel1.c b/src/Unwind/UnwindLevel1.c
index 76dd104..5b911de 100644
--- a/src/Unwind/UnwindLevel1.c
+++ b/src/Unwind/UnwindLevel1.c
@@ -63,8 +63,9 @@
       char functionBuf[512];
       const char *functionName = functionBuf;
       unw_word_t offset;
-      if ((unw_get_proc_name(&cursor1, functionBuf, 512, &offset) !=
-           UNW_ESUCCESS) || (frameInfo.start_ip + offset > frameInfo.end_ip))
+      if ((unw_get_proc_name(&cursor1, functionBuf, sizeof(functionBuf),
+                             &offset) != UNW_ESUCCESS) ||
+          (frameInfo.start_ip + offset > frameInfo.end_ip))
         functionName = ".anonymous.";
       unw_word_t pc;
       unw_get_reg(&cursor1, UNW_REG_IP, &pc);
@@ -160,8 +161,9 @@
       char functionBuf[512];
       const char *functionName = functionBuf;
       unw_word_t offset;
-      if ((unw_get_proc_name(&cursor2, functionBuf, 512, &offset) !=
-           UNW_ESUCCESS) || (frameInfo.start_ip + offset > frameInfo.end_ip))
+      if ((unw_get_proc_name(&cursor2, functionBuf, sizeof(functionBuf),
+                             &offset) != UNW_ESUCCESS) ||
+          (frameInfo.start_ip + offset > frameInfo.end_ip))
         functionName = ".anonymous.";
       _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): start_ip=0x%" PRIx64
                                  ", func=%s, sp=0x%" PRIx64 ", lsda=0x%" PRIx64
@@ -251,8 +253,9 @@
       char functionBuf[512];
       const char *functionName = functionBuf;
       unw_word_t offset;
-      if ((unw_get_proc_name(&cursor2, functionBuf, 512, &offset) !=
-           UNW_ESUCCESS) || (frameInfo.start_ip + offset > frameInfo.end_ip))
+      if ((unw_get_proc_name(&cursor2, functionBuf, sizeof(functionBuf),
+                             &offset) != UNW_ESUCCESS) ||
+          (frameInfo.start_ip + offset > frameInfo.end_ip))
         functionName = ".anonymous.";
       _LIBUNWIND_TRACE_UNWINDING(
           "unwind_phase2_forced(ex_ojb=%p): start_ip=0x%" PRIx64