convert to uint8_t* for binary data to fix -Wnarrowing build errors

Newer gcc versions default to -Werror=narrowing when using newer C++
standards (which we do).  This causes issues when we try to stuff a
value like 0xea into a char -- the value is out of range for signed
char bytes.  That's when gcc throws an error:
.../bytereader_unittest.cc: In member function 'virtual void Reader_DW_EH_PE_absptr4_Test::TestBody()':
.../bytereader_unittest.cc:400:55: error: narrowing conversion of '234' from 'int' to 'char' inside { } [-Wnarrowing]

BUG=chromium:579384
TEST=`make check` passes
R=mark@chromium.org

Review URL: https://codereview.chromium.org/1605153004 .

1 files changed, 3 insertions, 2 deletions

diff --git a/src/common/dwarf_cu_to_module.cc b/src/common/dwarf_cu_to_module.cc
index 1729d4ac..c52dffb3 100644
--- a/src/common/dwarf_cu_to_module.cc
+++ b/src/common/dwarf_cu_to_module.cc
@@ -43,6 +43,7 @@
 #include <cxxabi.h>
 #endif
 #include <inttypes.h>
+#include <stdint.h>
 #include <stdio.h>
 
 #include <algorithm>
@@ -140,7 +141,7 @@ DwarfCUToModule::FileContext::~FileContext() {
 }
 
 void DwarfCUToModule::FileContext::AddSectionToSectionMap(
-    const string& name, const char* contents, uint64 length) {
+    const string& name, const uint8_t *contents, uint64 length) {
   section_map_[name] = std::make_pair(contents, length);
 }
 
@@ -814,7 +815,7 @@ void DwarfCUToModule::ReadSourceLines(uint64 offset) {
     cu_context_->reporter->MissingSection(".debug_line");
     return;
   }
-  const char *section_start = map_entry->second.first;
+  const uint8_t *section_start = map_entry->second.first;
   uint64 section_length = map_entry->second.second;
   if (offset >= section_length) {
     cu_context_->reporter->BadLineInfoOffset(offset);